This is the Before/After of my most recent shot "coldness"
For information about the making please scroll down.
I did this shot using a little flashlight without much power and my shower. I put the flashlight behind me pointing towards the ceiling and set the camera to ISO 400, f/8 and an exposure time of 6s. I used the selftimer to get into the shower and positioning myself.
In postprocessing I corrected the color temperature, overlayed the original image with a bright BW version and blended both. After that I simply brightened the whole image using curves and cropping the left- and right hand border away. Thats it!